Oil filter



Oct. 12, 1954 E. E. MURRAY 2,691,446

, OIL FILTER Filed May 10, 1952 3 Sheets-Sheet l Z D W ff r6' ,.gg. 0 o

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o Y 27 2 23-5 i 30 /fff t /355 2/ 2/ E if 45 All( Q ,L 4 INVENTOR. ,Fr/766? T Mar/cg 9\ ln BY vzwyiq E ,7777/7446752 E. E. MURRAY Oct. 12, 1954 OIL FILTER 3 Sheets-Sheet 2 Filed May 10, 1952 /7 AfA/EVS.

E. E. MURRAY OIL FILTER oct. 12, 1954 3 Sheets-Sheet 3 Filed May 10, 1952 /m wf. ym mm m w. .r I. i im .pensivev than such `prior constructions. `the importantfeatures of the invention is the vprovision of a machine -which employs a lter- Patented Oct. 12, 1954 U NITE D S TAT ES FPATSfEN OFFICE OIL FILTER .Ernest E. 4Murray, Birmingham, Mich.

lApplication May 10, 1952,'seria1-Nm2sn1'r-7 14 Claims. 01. 2104196) The present invention relatesto. improvements in lters of theutype adapted .to yi'emoveioreign materials from liquids-and particularly. relates to viiltersfor removing metal particles .from cutting liquids.

Filters are now employed .which are disposed adjacent metal cutting vmachines :for vremoving metal particles from .the cuttingv liquids employed in the cutting operations of such-machines-and in :which cloth is disposedover .the .top of a Arectangular receptacleand supported by awire mesh. The cloth is pulled from oney end of the-receptacle across thetop and'beyondthe opposite'end Aof the receptacle. Gravity'a'lone is Aemployed for causing the liquid to pass through the cloth, leaving the metal particles embedded in the cloth. "The cutting liquid, which is relatively expensive, is

recirculated for the cutting operationafter it has beenltered. Thediflicult-ies With these prior filtersarethattheyare expensive, take up excessive oor space, .are slovvand :are not enicient "from the cutt-ingluidl relative to theV amount of hoor-space occupied. It' is also relatively less ex- One of `ing. element which is tubular in cross section. 'Such vilteringv element vis flexiblefand is preferably formed of a cloth, such :as cheese cloth, in

which the edges are sevvedtogether-torv form an elongated tube. The element is rolled to provide asubstantial supply orlength of the material for use v.and is so .disposedron the machine `that-the tubular element is extendedfrom 4the center of the machine, outwardly. around the edges thereof so thatall of the liquid containing vthe metal particles must pass throughthe filter- 4ing element Iin reaching. the vrecirc'ulating tank. As the filtering cloth-becomes clogged with the Lmetal particles,ifresh Asurfaces nare provided by .amount .oiioor ,1 spaceernployed. A further object of the invention is to provide .Jan improved lter. of `,the :type :mentioned .which is economi- .;cal :to .manufacture :relative Yto `prior constructions.

:Other objectsof f the present invention .Will befcome apparent from r the following specification, .fthe .drawings relating @thereto and from the y claims hereinafterset forth.

:Inthe drawings-iin .which like numerals are used: to.designate'likegparts inthe several views v throughout Figure .1 Ais arperspective.view of alter mechanism embody-ing features of :the present inven- Fig. 2 isatop, perspective-,view of aportion of the -structureshown in Fig.: l

Fig. 3.is.;a topplan'view, with parts broken away, of .the structure shown inaFig.` 1

Figfzlisa crosssectionalview, Withl parts in elevation, .takennsubstantially. along the line 4--4 of Fig.;1;

vcircuit employedwiththe controlsgof the present invention.

.Referring-.to the drawingspa roll or the `filter- `ingifmaterial;is, indicatecipat I vandnsuch rollis rotatablyv supported onfaf spindle t2, the ends of 35 which are supported Within theforked upper ends. oftuprights. Uprightsaare-inturn supported oma.:A horizontal bar 4, the ends. of which are'connected'A to uprights i 5 which are mounted ;ongthe'floor. ',The @filtering cloth .is unrolled and @brought downwardlyas indicatediat. and such tubular in; form candor, a f substantiaL-length in order to. .provide anxadequate operating supply. A. lteringnmeehanism, generally indicated; at

' 1, comprisesranupstanding:metalidrum .orreceptacle'fz'having an annular .openingg ;at' .;the top thereof.

openwork-.oriioraminouslsupport Il) is dis- ,.posedwithin the: receptacle adjacent the open top thereof and such supporti() isgenerally frustoeconical .in ,shape .and is ,in the I embodiment .-illustrateda vsheet metall member .havinga ,plu--y rality of uniformly spaced openings entirely over the area thereof. The outer end terminates in a reversed annular ange il and the periphery is substantially the same as that of the opening 9 so that the flange hangs over the opening to mount the support I onto the receptacle 6. The outer peripheral edge of the support lll is rounded so as to present a smooth rounded surface over which the filtering cloth is drawn, as will become more apparent from the later description.

The support I6 is corrugated or curved over a portion of its length, as best seen in Figs. 3, 4, and 6, with the corrugations being of gradually increasing depth from the large end of the support I D toward the smaller end thereof. Thus the support is so shaped that the linear distance around the periphery of any plane normal to the center line of the support is substantially uniform from top to bottom. Thus the linear distance around the support of any such plane is substantially the same as the linear distance around the outer or large peripherial edge of the support I0.

The circumference of the tubular filtering element 6 is also substantially the same as that of the opening 9, or the circumference at the outer periphery of the support IB, and with the support shaped as indicated above, the cloth of the element 6 will lie against the curved surfaces and will not bunch up. Thus, substantially the entire periphery of the tubular filter E will uniformly lie against the surface of the support IU and be exposed for filtering purposes. As the filtering cloth is drawn upwardly over the support, a substantially uniform area of the cloth is presented for filtering purposes from the central portion of the support to the outer periphery.

The cutting liquid carrying the metal particles from the cutting tool is carried through a conduit I2 to an annular outlet conduit I3. The conduit I3 has an annular slot or opening I4 (Fig. 4) formed therein so that as the unfiltered liquid is pumped from the cutting machine it is discharged through the slot 14. The annular conduit I3 is disposed within the receptacle 8 adjacent to but spaced from the support Il) and disposed centrally thereof.

The tubular filtering element 6, which is disposed above the filter l, passes through and under the annular conduit I3 and then upwardly and outwardly along the support IU and over and around the opening 9 and down along the sides of the receptacle 8. The element 6 is bunched as it passes through the ring I3 but opens up as it lies against the support I0 and is passed around the top annular opening of the receptacle completely therearound.

From the structure so far described, it is apparent that the unfiltered cutting fluid must pass through the filtering cloth 6 and through the openings of the support il! so that the clean and filtered liquid drops into the bottom of the receptacle 8 and any metal particles are embedded in the cloth of the ltering material and thus are removed from the liquid.

As the lter cloth becomes clogged with the metal particles, it will be appreciated that the of rubber covered rollers I6 which are rotated and which engage the filter cloth B on the outside of the receptacle 8 adjacent the upper edge thereof to pull the cloth around the opening 9.

The rollers I6 are driven and are mounted upon a drive shaft supported in the forked end of an upstanding support arm Il. The arm I1 is rotatably mounted upon a drive shaft i8 which is supported in a bracket I9. The brackets I9 for each of the rollers are mounted on an annular angle iron 26 which is disposed around the receptacle 8 in spaced relation thereto. The annular angle support 2D is in turn supported by upstanding frame members 2i which in turn are connected to the sides of a pan 22 disposed on the floor around the receptacle 8. Additional supports for the annular support 26 may be provided by frame members 23 which may be fixed to the upstanding roller supports 5.

The drive shaft on which each of the rollers I6 is mounted has a sprocket 2d connected to one end thereof and a drive chain 25 interconnects the sprocket 24 with another sprocket 26 which is connected to the shaft I8. Thus when the shaft I8, for each of the rollers I6, is rotated, the roller I6 would be correspondingly driven through the sprockets 24 and 26 and chain 25.

A ilexible or universal drive is provided for the shafts I8 and such drives include universal couplings or universal drive connections 2l. One of the drive shafts I8 is connected through a universal coupling 28 with the driven shaft of a gear reducer 29 which in turn is driven by an electric motor 36, through a belt and pulley connection 3I. Thus the single motor serves to drive all of the rollers I6 simultaneously through the flexible drive connections between the interconnected rollers IB.

The rollers I6 are mounted on the pivoted arms II and are resiliently urged toward the receptacle 8 and into engagement with the lter cloth by means of coil springs 32 which have their opposite ends connected to the outer end of pins 33 on the adjacent arms Il.

Elongated backing or bearing rollers 3A are rotatably mounted on brackets disposed on the outer surface of receptacle 8 adjacent the top thereof in such a position that they would be engaged by the rollers i6. The tubular ltering cloth is disposed between the rollers 3d and I6, and as the rollers I6 rotate, in the direction of the arrow in Fig. 4, the cloth 6 will be engaged and gripped between rollers I6 and 33 to cause the material B to be advanced downwardly on the outside of the receptacle 8, pulling more fresh cloth from the roll I and outwardly from the center of the support I6.

As the cloth 6 passes the rollers I6, it is still tubular in form and, so that the contaminated cloth can be readily dispensed with and to facilitate the feeding or advancing operation, it is split or slit longitudinally by means of a rotating cutter 36. Such cutter 36 is in the form of a disc cutter mounted on a suitable support under the feed rollers I6. The cutter 36 is driven by means of an electric motor 37.

In order to speed the separation of the foreign material from the liquid and to cause the liquid to pass through the filtering cloth into the collecting chamber at the bottom of the receptable 8, a blower or exhaust fan 3l is disposed under the cutter 36 and has a conduit 39 which communicates with the interior of the receptacle 8 below the cutter 36 and under the support I0 through an opening 40. The fan or blower 38 @the support I0, the -liquid'is forced vfthriug'h "the 'filtering cloth 6 and thus increasesfth'eelciency of-the'unit. e e y VA recirculating pump Y43 communicates with the interior of the receptacles-'adjacent thebot- Acontrol means are best shown in '"Figs. 2, 7, and

8. A float 46 is mounted "o'n' afiloatarm 4l `'which in turn is pivotally mounted toafcontrol "box "48 mounted on the upstanding portion of conduit I2. The arm 4l has another arm integral therewith which pivots withthe a'rrni41 as the float `EIS rises and falls and such arm isk connected to mercury switches MSI and MS2 wthin'the control box. The mercury switches vand-the motors 30, 3l, and 4I are electrically interconnected as shown by the electrical diagram in vFig. 8. The electrical elements, per se, form nopart of the present invention as theyfare well-known in the art, and the motors are energized or de-energized through the action of the `float 46 onthe mercury switches MSI and MS2, depending upon the level of the liquid'ab'oveA the filtering cloth l and support Ill. Y

Referring to Fig. 7, such levels are diagrammatically illustrated, with line` 48 indicating low level, line 4@ indicating intermediate'level, and line 50 indicating high level. yWith the float 4E between low level 48 and intermediate level '49, MSI is closed so that theexhaust motor v4I is energized and MS2is open so that feed motor 30 and cutter motor31 are de-energized. Thus the exhaust fan 38 will act to supplement the action of gravity and draw the liquid through the filtering cloth until the cloth becomesl so clogged that the liquid levelr'ises above it.v When the liquid level reaches line 49,' the noemt-"46 will open MSI, thus de-energizing the blowermotor. As the level rises to high level 50, the float'46 will act to close MS2, thus energizing thei advancing motor 3G and the slitting motor v 3l. The rollers IE are then driven to advance the clothE downwardly along the'outside of the receptacle, pulling the cloth olf the roller I6 and presenting clean and fresh iiltering surfaces. Liquid may then easily pass through the cloth, and when it drops to line 49, MSI Vis closed and MS2 is open, thus energizing the exhaust fan and de-energizing the feed and cutter motors. This cycle is repeated as the liquid vcontinuesv to be fed intothe'filter.

Formal changes vmay be'inade in the specific embodiment of the invention described'without departing from the spirit of the invention, the scope of which is 'commensurate 'with the 'appended claims.

What is claimed is: l

l. In a filtering device for separating foreign material from liquid,'a receptaclehaving an open top, support means disposed --above -said A-top adapted to support a supply' offoraminous flexible filtering material, 4an open-workfsupportffdisposed within said receptacle-adjacent said openl top and adapted to supportfsaidfltering.material, said ltering materialbeingdadapted' to be disposed completelyaround the upper edge-of said receptacle yandfdownftl'ie outside Lthereof, feed "means disposed around the "outside of 1said receptacle and adapted'to eng-age said lteri'ng material to'vadvancesaidmaterial outwardly around vsaid upper edge, andmeans to supply liquid: con- -taining foreign vmaterial into said receptacle above Vsaid Y openwork support.

2. In a ltering device for separating foreign material'from'liquid, a receptacle havingA an annular open'top, 'support means -disposed above said top adapted-'to support-a supply of forami- 4nous flexible tubularAlteringmaterial, an openwork support disposed withinsaid'receptacle adjacent said open top and adapted Ito support said iiltering material, said ltering material being adapted to be disposed from the center outwardly and completely around the upper edge of said receptacle and 'down -theoutside thereof, feed means disposed around the outside of said receptacle and adapted to engage'said filtering material to advance said material outwardly around said upper edge, yand means tosupply liquid'containing foreign material into -said receptacle above said openwork support.

3. In a ltering" device for separating foreign material from liquid, a receptacle having'an annular open top, support means disposed above nsaid top adapted to `support a 'supply of foraminous flexible` tubular filtering material, an openworksupport disposedwithin said receptacle adjacent said open top and adapted to support ceptacle above said openworksupport.

4. In afiltering devicefor separating foreign material from liquid, a receptacle having anannular open top, support'means disposed above said top yadapted v'to support a supply of foraminous flexible tubular ltering'material, an openwork support disposed withinL said receptacle adjacent said open top and adapted to support saidiiltering material, said filtering material being adapted to be disposed from the center outwardly and completely.v around the upper 'edge of said receptacle and'down the outside thereof, feed meansdisposed Aaroundthe outside `of said receptacle'a'nd adapted to engage saidltering material to advancesaid `material outwardly around said upper edge, lan exhaust fan cornmunicating with said receptacle under said openwork'support, and meansto supply liquid containing A:foreign `material into said receptacle above said openwork support.

'5. In a nltering device for separating foreign material from liquid, a receptacle having-an annular open top, support means disposed above said top adapted to i support a l supply of foraminous ilexible tubular iiltering material, an openworl; 'support' disposed within "said receptacle adjacent said open top and adapted to support said ltering material, said filtering" material vbeing adapted to be disposed from the center outwardly and"completely'around the upper edge of said 'receptacle' and downthefoutside thereof,

feed meansdisposeda'round theoutside of said.

receptacle -andvfadapted to engage said lfiltering material to advance said `material outwardly around said 1 upperfedge, a1-cutter I disposed under said feed means and adapted to slit said tubular filtering material, an exhaust fan communicating with said receptacle under said openwork support, and means to supply liquid containing foreign material into said receptacle above said openwork support.

6. In a ltering device for separating foreign material from liquid, a receptacle having an annular open top, support means disposed above said top adapted to support a supply of foraminous exible tubular ltering material, an openwork support disposed Within said receptacle adjacent said open top and adapted to support said filtering material, said filtering material being adapted to be disposed from the center outwardly and completely around the upper edge of said receptacle and down the outside thereof, feed means disposed around the outside of said receptacle and adapted to engage said filtering material to advance said material outwardly around said upper edge, a cutter disposed under said feed means and adapted to slit said tubular filtering material, an exhaust fan communicating with said receptacle under said openwork support and under said cutter, and means to supply liquid containing foreign material into said receptacle above said openwork support.

7. In a nltering device for separating foreign material from liquid, a receptacle having an annular open top, support means disposed above said top adapted to support a supply of foraminous flexible tubular filtering material, an openwork support disposed Within said receptacle adjacent said open top and adapted to support said filtering material, said filtering material being adapted to be disposed from the center outwardly and completely around the upper edge of said receptacle and down the outside thereof, feed means disposed around the outside of said receptacle and adapted to engage said filtering material to advance said material outwardly around said upper edge, a cutter disposed under said feed means and adapted to slit said tubular nltering material, an exhaust fan communicating with said receptacle under said openwork support and under said cutter, a nrst motor operatively connected to said feed means, a second motor operatively connected to said cutter, a third motor operatively connected to said exhaust fan, control means for operating said motors in response to the level of the unfiltered liquid above said filtering material Within said receptacle, and means to supply liquid containing foreign material into said receptacle above said openwork support.

8. In a ltering device for separating foreign material from liquid, a receptacle having an a nular open top, support means disposed above said top adapted to support a supply of foraminous fiexible tubular filtering material, an openwork support disposed within said receptacle adjacent said open top and adapted to support said filtering material, said ltering material being adapted to be disposed from the center outwardly and completely around the upper edge of said receptacle and down the outside thereof, feed means disposed around the outside of said receptacle and adapted to engage said filtering material to move said material outwardly around said upper edge, a cutter disposed under said feed means and adapted to slit said tubular filtering material, an exhaust fan communicating With said receptacle under said openwork support and under said cutter, a rst motor operatively connected to said feed means, a second motor operatively connected to said cutter, a third motor operatively connected to said exhaust fan, control means for operating said motors in response to the level of the unltered liquid above said filtering material within said receptacle, said control means including float controlled electric switches and circuit controls to energize said third motor and deenergize said iirst and second motors when said float is between low and intermediate level and to de-energiae said third motor When said float is at intermediate level and energize said first and second motors when said float is at high level, and means to supply liquid containing foreign material into said receptacle above said openwork support.

9. In a filtering device for separating foreign material from liquid, a receptacle having an annular open top, support means disposed above said top adapted to support a supply of foraminous iiexible tubular filtering material, an openworl; support disposed Within said receptacle adjacent said open top and adapted to support said filtering material, said filtering material being adapted to be disposed from the center outwardly and completely around the upper edge of said receptacle and down the outside thereof, roller feed means disposed around the outside of said receptacle and adapted to engage said ltering material to advance said material outwardly around said upper edge, and means to supply liquid containing foreign material into said receptacle above said openwork support.

l0. In a filtering device for separating foreign material from liquid, a receptacle having an annular open top, support means disposed above said top adapted to support a supply of foraminous flexible tubular filtering material, an openwork support disposed Within said receptacle adjacent said open top and adapted to support said iiltering material, said filtering material being adapted to be disposed from the center outwardly and completely around the upper edge of said receptacle an down the outside thereof, feed means including spaced rollers disposed around the outside of said receptacle and adapted to engage said filtering material to advance said material outwardly around said upper edge, means to rotate said rollers, means to resiliently urge said rollers to said receptacle into engagement with said filtering material, and means to supply liquid containing foreign material into said receptacle above said openwork support.

11. In a filtering device for separating foreign material from liquid, a receptacle having an annular open top, support means disposed above said top adapted to support a supply of foraminous flexible tubular filtering material, a frustoconical openwork support disposed within said receptacle adjacent said open top and adapted to support said filtering material, said filtering material being adapted to be disposed from the center outwardly and completely around the upper edge of said receptacle and down the outside thereof, feed means disposed around the outside of said receptacle and adapted to engage said filtering material to advance said material outwardly around said upper edge, and means to supply liquid containing foreign material into said receptacle above said openwork support.

l2. In a ltering device for separating foreign material from liquid, a receptacle having an annular open top, support means disposed above said top adapted to support a supply of foraminous iiexible tubular filtering material, a frustoconical openwork support disposed Within said receptacle adjacent said open top and adapted to support said ltering material, said support being shaped so that the linear distance around the periphery of any plane normal to the center is substantially uniform from top to bottom, said iiltering material being adapted to be disposed on said support from the center outwardly and coml pletely around the upper edge of said receptacle and down the outside thereof, feed means disposed around the outside of said receptacle and adapted to engage said ltering material to advance said material outwardly around said upper edge, and means to supply liquid containing foreign ma terial into said receptacle above said openworll: support.

13. In a filtering device for separatingr foreign material from liquid, a receptacle having an annular open top, support means disposed above said top adapted to support a supply of forami nous iiexible tubular ltering material, an openwork support disposed within said receptacle adjacent said open top and adapted to support said ltering material, means to supply liquid containing foreign material into said receptacle above said openwork support, said last named means in cluding an annular supply duct disposed centrally of said receptacle and through and under which such tubular filtering material is adapted to pass from the center outwardly and completely around the upper edge of said receptacle and down the outside thereof, and feed means disposed around the outside of said receptacle and adapted to engage said lterng material to move said material outwardly around said upper edge.

14. In a iiltering device for separating foreign material from liquid, a receptacle having an annular open top, support means disposed above said ltop adapted to support a supply ci foraminous flexible tubular filtering material, a frusto-conical openwork support disposed within said receptacle adjacent said open top and adapted to support said filtering material, means to supply liquid containing foreign material into said receptacle above said openwork support, said last named means including an annular supply duct disposed centrally of said receptacle and said openwork support and through and under which said tubular ltering material is adapted to pass from the center outwardly and completely around the upper edge of said receptacle and down the outside thereof, and feed means disposed around the outside of said receptacle and adapted to engage said iiltering material to move said material outwardly around said upper edge.

References 'Cited in the le of this patent UNITED STATES PATENTS Number Name Date 1,837,368 Medn Dec. 22, 1931 FOREIGN PATENTS Number Country Date 346,198 Italy Feb. 2, 1937 92,978 Germany July 31, 1897 

